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...blocklists, blackhole lists, or DNSBL's<ref>DNSBL is an acronym meaning a BlackList that is published in DNS, the [[Domain Name System]].</ref>) are most commo
...tes and other locations where criminals typically "harvest" addresses. IPblacklists are most useful in efficiently blocking high-volume and persistent sources

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...blocklists, blackhole lists, or DNSBL's<ref>DNSBL is an acronym meaning a BlackList that is published in DNS, the [[Domain Name System]].</ref>) are most commo
...tes and other locations where criminals typically "harvest" addresses. IPblacklists are most useful in efficiently blocking high-volume and persistent sources

...dozens of other addresses (perhaps a chain letter). If any one of those recipient's computers is infected, these cc'd addresses can be "harvested".
...computer lab), and the traffic is light enough that it takes no special equipment to extract the right data packets. If these packets are plain text (no

...elisting]] by individual recipients when there is a pre-existing relationship.
...atistics on each identity are too sparse. Nevertheless, [[IPblacklist|IPblacklists]] are useful in efficiently blocking high-volume and persistent sources, a

...blocks are processes that handle the message on its way from Author to Recipient. The links between blocks are [[Transmission Control Protocol|TCP conn
...tion. It may be something as simple as consolidation of the mail from multiple departmental servers to one corporate server.

...to perform a recursive sequence of database lookups with both the sender's IP address and given e-mail address after the 'MAIL FROM' command in the SMTP
...by e-mail. At first, spammers used their own sender addresses, which were blacklisted soon. Later they used random sender addresses, but again this could easil

...plained by looking separately at different perspectives, applying the principle of [[Separation of concerns|separation of concerns]]. There are two coeq
...P/IP, and the functionality of routers is entirely encapsulated within the IP layer of this [[Internet Protocol Suite | protocol stack]]. We can ignore

...plained by looking separately at different perspectives, applying the principle of [[Separation of concerns|separation of concerns]]. There are two coeq
...P/IP, and the functionality of routers is entirely encapsulated within the IP layer of this [[Internet Protocol Suite | protocol stack]]. We can ignore

...d revealing diplomatic material which critics say needs to be private for diplomats to function. More generally, critics contend that not all secrets sho
...w if that is legitimate? If too much is revealed, how are the military or diplomats to function?